Patent GB-339016-A (GB)
Title: Improvements in zero printing arrangements for calculating machines, cash registers and similar machines
IPC: G06C11/04
Filed: 1929-09-16
Abstract: 339,016. Brewer, G., (Krupp Akt.-Ges., F.). Sept. 16, 1929. Controlling printing of zeros.-In printing mechanism for calculating-machines, the type carrier has " clear " and "0-9" positions, and receives its differential settings through a rack and an intermediate pinion, the latter being mounted on a slide coupled to a shifting device so that it may be moved for effecting the adjustment of the type from " clear " to " zero " position. Two embodiments of the invention are described, the first being that shown in Figs. 1, 2, 4 and 5. Type wheels 1 for nine denominations (designated a to i) are connected to wheels 11 by wheels 2, tubes 3, wheels 4, intermediate pinions 5, racks 6 and wheels 7, 8. The wheels 11 are connected to members 13 which, when the machine is operated, are moved from an amount set by a previous operation to that set by a new operation. The pinions 5<a> - - 5<c> (controlling the three lowest denominations) and 5i (controlling the highest denomination) are journaled on stationary pivots 14, 15. The pinions 5<d> - - 5<h> are journaled each on a separate pin 16 mounted in a corresponding slide, 18. To each slide 18 is pivoted a lever 25 which is locked in one of two positions by a common locking bar 28 controlled by a cam 33. To each slide 18 is also pivoted a coupling lever 36. Coupling levers 36<g> and 36<e> are provided with overlying and underlying lugs 52, 53, so arranged that the depression of any coupling lever causes the depression of all such levers to the right of it. The type wheels are arranged as shown in Fig. 5. Those for the denominations d to h are provided with both a zero and also a " clear " mark. Instead of having a clear mark the wheels may be so arranged that no character is printed in the clear position. The three right-hand denominations a - c have no clear sign, and the extreme left-hand denomination i has a clear sign but no zero. If an amount is set so as to move one of the members 13 controlling one of the type wheels d - - h, a corresponding movement is transmitted to the respective type wheel, but that wheel will move so that a numeral of value less by one than the amount set on the member 13 is brought opposite to the printing line 57, Fig. 5. During this transmission, however, the rearward movement of the corresponding rack 6 depresses the adjacent coupling lever 36, releases it from the control of a fixed rod 41 and causes its hooked end 42 to engage a common rod 44 extending between two arms 43 which swing about a shaft 45 and are controlled by a cam 48. By reason of the lugs 52, 53, all those coupling levers to the right of the one operated by the rearwardly moved rack 6 are also brought into engagement with the rod 44. The cam 33 then moves the locking bar 28 to release the levers 25, and the cam 48 causes the rod 44 to swing to the right and, by moving those racks 18 which are coupled to it, to move the respective printing wheels one unit more. The locking bar 28 then again engages the levers 25, the printing is effected, the levers 25 are then freed, the rod 44 swings to the left, and finally the levers 25 are again locked by the bar 28. When the rack 6 returns to its normal' position, springs 37 restore the coupling levers 36. The type wheels are arranged for printing at two points, but only one platen 60 situated below the record strip 68 and operated by a cam 65 is shown. The mechanism controlling printing in the highest denomination i has no slide 18, but when this denomination is used it is necessary to move the type wheel d - - h from clear to zero position, and for this purpose a special coupling lever 36<i> contacting with its rack bar 6<i> and having a lug 52 but no hooked end 42 is provided, the, said coupling lever being pivoted to a stud 55. In the second embodiment, Figs. 10, 11, 12, all thewheels are provided with means for printing a clear sign, but the three lowest denominations a - - c are so arranged that if an amount is printed in any one of them, the other two will print zero. The three pinions 5a - - 5<c> are mounted on a common pivot 16<a-c> in a common slide 18<a-c> having one coupling lever 36<a-c> which is depressed upon the operation of any one of the racks 6 of the denominations a - - c and which has a lug 53 underlying the adjacent coupling lever 36<d> of the series d - - h. Instead of printing a star in the three denominations a - - c, thetype wheels a - - c may be arranged to print the word " clear," stars being printed in the higherdenominations.